. >> reporter: four years ago she was swept up by the tide of enthusiasm around candidate barack obama. >> i was an obama-mamma. and i was proud to claim that. >> reporter: not so much now? >> not so much. i'm not as enthused. >> reporter: do you think romney could be that change? >> it could be a change. i just don't know if it will be for the better. >> i would say no, i'm not better off now than before. >> reporter: single dad omar lopez came to the u.s. from colombia 13 years ago. now a u.s. citizen, he owns a real estate business in las vegas, surviving one of the most depressed housing markets in the country. he supported president obama four years ago. >> we have to downsize. >> reporter: he too has grown disillusioned. what are governor romney's loopholes will romney close, what will he do about immigration? you're holding out making a decision? >> i'm still holding out, yes. >> reporter: that's why president obama was back in nevada today. both candidates are battling hard for this battleground state. on the ground to get out the vote, carpet bombing the airwaves with politica